Journal of Materials and Engineering Structures
Volume 6, Numéro 2, Pages 177-188
2019-06-30
Evaluation Of Fatigue Limit And Mechanism Of Fatigue Crack Initiation Of Epoxy Coatings Used As Lining For Crude Oil Storage Tanks
Authors : Jasim Haider Hadi .
Abstract
In this paper, the fatigue performance of three types of epoxy coatings (pure, Novolac and reinforced by glass-flake) were studied in crude oils and air environments. A group of equipment is constructed in a laboratory and used in rotating bending fatigue tests of single and double layers of coats applied to ASTM A537-C1 steel. The results showed that the fatigue limit of A537 steel improved after coatings and that the fatigue limits of the coated and uncoated steel conducted in the crude oil solution was significantly lower than those obtained in the air environment. The results of the microscopic inspection indicate that there are three types of fatigue cracks initiation mechanism in steel coatings and environment affects the shape of fracture surface. In addition, the observation of the broken section of the single-layer test sample showed that it has more coat failure compared to the double layers coats.
Keywords
A537 steel; crude oil; epoxy coating
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